From: Michael K. Johnson Date: Wed, 22 Apr 2009 01:44:48 +0000 (-0400) Subject: x86: more than 8 32-bit CPUs requires X86_BIGSMP X-Git-Tag: firefly_0821_release~14320^2~5 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2a3313f494c2f3f74a27d66f0f14b38558b7dba2;p=firefly-linux-kernel-4.4.55.git x86: more than 8 32-bit CPUs requires X86_BIGSMP $ cat x86-more-than-8-cpus-requires-bigsmp.patch Enforce NR_CPUS <= 8 limitation if X86_BIGSMP not set Configuring more than 8 logical CPUs on 32-bit x86 requires X86_BIGSMP to be set in order to boot successfully, if more than 8 logical CPUs are actually found at boot time. The X86_BIGSMP help text describes that it is required to be set if more than 8 CPUs are configured, but this was previously not enforced. This configuration error has affected multiple distributions: https://bugzilla.redhat.com/show_bug.cgi?id=480844 https://issues.rpath.com/browse/RPL-3022 Signed-off-by: Michael K Johnson LKML-Reference: <20090422014448.GB32541@logo.rdu.rpath.com> Signed-off-by: H. Peter Anvin --- diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index c9086e6307a5..b5cda6c03d1d 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -664,6 +664,7 @@ config MAXSMP config NR_CPUS int "Maximum number of CPUs" if SMP && !MAXSMP + range 2 8 if SMP && X86_32 && !X86_BIGSMP range 2 512 if SMP && !MAXSMP default "1" if !SMP default "4096" if MAXSMP